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RPMs - Help Settle a Debate

Discussion in 'General Automotive' started by AeroCooper, Apr 24, 2013.

?

Using Fuel or No?

  1. The Injectors Cut Off - Zero Fuel Used

    11 vote(s)
    28.2%
  2. The Engine Needs Fuel To Not Stall - Fuel Used

    28 vote(s)
    71.8%
  1. Sep 6, 2013 at 7:39 AM
    #21
    Del Scorcho

    Del Scorcho O-------l

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    Suck it California, I'm moving to Idaho...
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    Nope...
    If you have a Scan Gauge set it to GPH (gallons per hour) when you let off the gas completely to coast you can see it drop down to around .4 gph. About where it sits at idle. On level road at highway speeds I usually see around 3.8 to 4.5 gph. Put your foot in and you'll hit 10 to 13.

    The keep MPHs highs, the GPHs low and you'll get good MPGs.
     
  2. Sep 6, 2013 at 7:49 AM
    #22
    worthywads

    worthywads Well-Known Member

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    The scangauge does NOT display fuel use correctly when coasting.

    If you display the Closed/Open Loop function you will see it go into OPEN LP when you are in deceleration fuel cut off, but it won't show 0.0 gph. Don't know why scangauge can't get this right but it will even show 0.1gph with the engine off?
     
  3. Sep 6, 2013 at 8:08 AM
    #23
    tooter

    tooter play every day

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    Built for maximum low end torque, tooter II.VII intake manifold spacer, LCE long tube header, Injen long tube intake, 2,900 rpm torque peak.
    What I miss with DFCO is backfiring while decelerating. My 1988 4 cylinder Toyota Pickup was the last year with regular carburetor, and it sounded really cool! :)
     
  4. Sep 6, 2013 at 9:30 PM
    #24
    Del Scorcho

    Del Scorcho O-------l

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    Nope...
    Huh. I'll have to take a look at that. When it comes to that kind of information, isn't the scangauge just displaying what the ECU actually doing? If it can't get that right then the MPG ACT & AVE will be off as well. To get an instant MPG read out, it's just taking real time GPH and factoring in the instant MPH. Then over time, creating an average.
     
  5. Sep 6, 2013 at 9:34 PM
    #25
    User Name01

    User Name01 I leave on a donkey and come back on a horse

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    mehh
    I know that in the Chevy Tahoe/Yukon versions in Mexico, two of the injectors in the v8 shut off when coasting(downhill/straight highway) becomes a "v6"
     
  6. Sep 6, 2013 at 10:34 PM
    #26
    worthywads

    worthywads Well-Known Member

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    Not sure how, but the scangauge is estimating GPH, there is no direct fuel use from OBDII. Must be pretty accurate most of the time, but not with DFCO, and since that isn't a large percentage of total run time it gets adjusted by the fuel adjustment.
     
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